<template>
  <div>
      <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item> 
    </el-breadcrumb>

     <!-- 卡片视图区域 -->
      <el-card>
        <el-alert show-icon title="注意：只能选择三级分类参数" type="warning" :closable="false">
        </el-alert>

         <!-- 选择商品分类区域 -->
         <el-row class="cat_opt">
            <el-col >
               <span class="cat_opt">选择商品分类:</span>
                 <!-- 选择商品分类的 级联选择框 --> 
                 <el-cascader expand-trigger="hover" :options="catelist"
                :props="cateProps"
                v-model="selectedKeys"
                @change="handleChange"
                clearable >
              </el-cascader> 
            </el-col>
         </el-row>

           <!-- tab 页签区域 -->
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <el-tab-pane label="动态参数" name="many">
               <!-- 添加参数的按钮 -->
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
               <!-- 动态参数的表格 -->
               <el-table :data="manyTabData" border stripe>
                 <el-table-column type="expand">
                     <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                          {{item}}
                        </el-tag>

                        <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                          >
                          </el-input>
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
 
                     </template>
                 </el-table-column>
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delate" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
               </el-table>
           
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
             <!-- 添加属性的按钮 -->
               <el-button type="primary" size="mini" :disabled="isBtnDisabled"  @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性的表格 -->
               <el-table :data="onlyTabData" border stripe>
                   <el-table-column type="expand">
                     <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                          {{item}}
                        </el-tag>

                        <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                          >
                          </el-input>
                          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
 
                     </template>
                 </el-table-column>
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delate" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
               </el-table>
              </el-tab-pane>
           </el-tabs>

      </el-card>


       <!-- 添加参数的对话框 -->
      <el-dialog
        :title=" '添加' + titleText"
        :visible.sync="addDialogVisible"
        width="30%"
        @close="addDialogClosed">
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
       </el-form>   

        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>


       <!-- 修改参数的对话框 -->
      <el-dialog
        :title=" '修改' + titleText"
        :visible.sync="editDialogVisible"
        width="30%"
        @close="editDialogClosed">
       <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
       </el-form>   

        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>



  </div>
</template>

<script>
export default {
  data(){
    return {
      catelist:[],
       //指定级联选择器的配置对象
      cateProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      // 选中的 分类的ID数组
      selectedKeys:[],
      // 被激活的页签的名称
      activeName:'many',
      // 动态参数的数据
      manyTabData:[],
      // 静态参数的数据
      onlyTabData:[],
      //  控制添加对话框的显示与隐藏
      addDialogVisible:false,
     //  控制修改对话框的显示与隐藏
      editDialogVisible:false,
      // 添加参数的表单对象
      addForm:{
        attr_name:''
      },
      // 修改参数的表单对象
      editForm:{
        attr_name:''
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          {required:true,message:'请输入参数名称',trigger:'blur'}
        ]
      },
      // 修改表单的验证规则对象
      editFormRules:{
        attr_name:[
          {required:true,message:'请输入参数名称',trigger:'blur'}
        ]
      },
      // 控制按钮 与文本框的切换显示
      // inputVisible:false,
      // // 文本框输入的内容
      // inputValue:''
    } 
  },
 created(){
    this.getCateList()
  },
 methods:{
    // 获取所有的商品分类列表 
    async getCateList(){
      const {data:res} = await this.$http.get('categories')

      if(res.meta.status !==  200){
        return this.$message.error('获取商品分类失败!')
      }
   
      this.catelist = res.data    
    },
    // 选择项发生变化 触发这个函数
    handleChange(){
        this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick(){
        this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData(){
       // 判断数据长度  console.log(this.selectedKeys) 
      if(this.selectedKeys.length !== 3){
        this.selectedKeys = []  
        this.manyTabData = []
        this.onlyTabData = []
        return 
      }  
      // 根据所选分类的 id 和当前所处的面板 获取对应的参数 
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
        params:{sel: this.activeName}
      })

      if(res.meta.status !== 200){
        return this.$message.error('获取参数列表失败')
      }

     // console.log(res.data)
     res.data.forEach(item => {
       item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
       // 控制文本框的显示与隐藏
       item.inputVisible = false
       // 文本框中输入的值
       item.inputValue = ''
     })
      if(this.activeName == 'many'){
        this.manyTabData = res.data
      }else{
        this.onlyTabData = res.data
      }

  
    },
    // 监听添加对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    //  点击按钮 添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid =>{
        if(!valid) return

        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if(res.meta.status !== 201){
          return this.$message.error('添加参数失败')
        }

        this.$message.success('添加参数成功')
        this.getParamsData()
        this.addDialogVisible = false
      }) 
    },
    // 点击 按钮 展开修改的 对话框
    async showEditDialog(attr_id){
      // 查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
        params:{attr_sel: this.activeName}
      })

       if(res.meta.status !== 200){
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data 
        this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 修改参数信息
     editParams(){
       this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return 
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,attr_sel:this.activeName
        })
         if(res.meta.status !== 200){
          return this.$message.error('修改参数信息失败')
        }
        this.$message.success('修改参数信息成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },

    // 根据id 删除对应的参数项
    async removeParams(attr_id){
    // 简写
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err);
        // console.log(result) 
        // 判断用户是否选择删除
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除');
        }
     
        // 发送删除请求
        const {data: res }= await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status !== 200){
          return this.$message.error('删除参数失败')
        }

        this.$message.success('删除参数成功')
        this.getParamsData()
    },
    // 文本框失去焦点或摁下了 enter 都会触发
    async handleInputConfirm(row){
      if(row.inputValue.trim().length === 0){
          row.inputValue = ''
          row.inputVisible = false
          return 
      }
      // 准备添加数据
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      this.saveAttrVals(row)
    },
    
    async saveAttrVals(row){
      // 发送请求 保存数据
       const {data: res }= await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
         attr_name:row.attr_name,
         attr_sel:row.attr_sel,
         attr_vals:row.attr_vals.join(' ')
       })

        if(res.meta.status !== 200){
          return this.$message.error('修改参数失败')
        } 
        this.$message.success('修改参数成功')
    },
    //点击按钮 展示文本输入框
    showInput(row){
      row.inputVisible = true
      // 让文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的 参数可选项
    handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
    }

},
 computed:{
    // 如果按钮需要被禁用 则返回 true 否则返回 false
    isBtnDisabled(){
      if(this.selectedKeys.length != 3){
        return true
      }else{
        return false
      } 
    },
    // 当前选中的 三级分类 id 
    cateId(){
      if(this.selectedKeys.length  == 3){  
        return   this.selectedKeys[2]
      } 
      return null
    },
    // 动态计算标题的文本
    titleText(){
      if(this.activeName === 'many'){
        return '动态参数'
      }else{
        return '静态属性'
      }
    }

  }
}

</script>

<style scoped>
.cat_opt{
  margin: 15px ;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
